A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as
Sahay Sir > Question Answers > A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as
In a compound microscope, the magnified virtual image is formed at a distance of 25 cm from the eye-piece. The focal length of its objective lens is 1 cm. If the magnification is 100 and the tube length of the microscope is 20 cm, then the focal length of the eye-piece lens (in cm) is ____
18
Sep
In a compound microscope, the magnified virtual image is formed at a distance of 25 cm from the eye-piece. The focal length of its objective lens is 1 cm. If the magnification is 100 and the tube length of the microscope is 20 cm, then the focal length of the eye-piece lens (in cm) is [...]
A circular disc of mass M and radius R is rotating about its axis with angular speed ω1. If another stationary disc having radius R/2 and same mass M is dropped co-axially on to the rotating disc. Gradually both discs attain constant angular speed ω2. The energy lost in the process is p% of the initial energy. Value of p is _____.
18
Sep
A circular disc of mass M and radius R is rotating about its axis with angular speed ω1. If another stationary disc having radius R/2 and same mass M is dropped co-axially on to the rotating disc. Gradually both discs attain constant angular speed ω2. The energy lost in the process is p% of the [...]
The specific heat of water = 4200 J kg^–1 K^–1 and the latent heat of ice = 3.4 × 10^5 J kg^–1. 100 grams of ice at 0°C is placed in 200 g of water at 25°C. The amount of ice that will melt as the temperature of water reaches 0°C is close to (in grams)
18
Sep
The specific heat of water = 4200 J kg^–1 K^–1 and the latent heat of ice = 3.4 × 10^5 J kg^–1. 100 grams of ice at 0°C is placed in 200 g of water at 25°C. The amount of ice that will melt as the temperature of water reaches 0°C is close to (in [...]
The following figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surface is (Planck’s constant h = 6.62 × 10^–34 J.s)
18
Sep
The following figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surface is (Planck’s constant h = 6.62 × 10^–34 J.s) A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered [...]
A tennis ball is released from a height h and after freely falling on a wooden floor it rebounds and reaches height h/2. The velocity versus height of the ball during its motion may be represented graphically by (graph are drawn schematically and on not to scale)
18
Sep
A tennis ball is released from a height h and after freely falling on a wooden floor it rebounds and reaches height h/2. The velocity versus height of the ball during its motion may be represented graphically by (graph are drawn schematically and on not to scale) A balloon filled with helium (32°C and 1.7 [...]
Blocks of masses m, 2m, 4m and 8m are arranged in a line on a frictionless floor. Another block of mass m, moving with speed v along the same line (see figure) collides with mass m in perfectly inelastic manner. All the subsequent collisions are also perfectly inelastic. By the time the last block of mass 8 m starts moving the total energy loss is p% of the original energy. Value of ‘p’ is close to
18
Sep
Blocks of masses m, 2m, 4m and 8m are arranged in a line on a frictionless floor. Another block of mass m, moving with speed v along the same line (see figure) collides with mass m in perfectly inelastic manner. All the subsequent collisions are also perfectly inelastic. By the time the last block of [...]
Particle A of mass mA = m/2 moving along the x-axis with velocity v0 collides elastically with another particle B at rest having mass mB = m/3. If both particles move along the x-axis after the collision, the change Δλ in de-Broglie wavelength of particle A, in terms of its de-Broglie wavelength (λ0) before collision is
18
Sep
Particle A of mass mA = m/2 moving along the x-axis with velocity v0 collides elastically with another particle B at rest having mass mB = m/3. If both particles move along the x-axis after the collision, the change Δλ in de-Broglie wavelength of particle A, in terms of its de-Broglie wavelength (λ0) before collision [...]
A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s^–2. The density of water is 1 gm cm^–3 and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980 cm/s^2)
18
Sep
A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s^–2. The density of water is 1 gm cm^–3 and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980 cm/s^2) A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards [...]
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil? Three positions shown describe : (a) the magnet’s entry (b) magnet is completely inside and (c) magnet’s exit.
18
Sep
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of the following series of observations will be seen on the galvanometer G attached across the coil? Three positions shown describe : (a) the magnet’s entry (b) magnet is completely inside and (c) magnet’s exit. A [...]
A small bar magnet placed with its axis at 30° with an external field of 0.06 T experiences a torque of 0.018 Nm. The minimum work required to rotate it from its stable to unstable equilibrium position is
18
Sep
A small bar magnet placed with its axis at 30° with an external field of 0.06 T experiences a torque of 0.018 Nm. The minimum work required to rotate it from its stable to unstable equilibrium position is A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can [...]